Temperature Compensation in pH meter-A Survey

Abstract

The measurement of pH has a great significance in many applications, ranging from water quality management through the agricultural to the biomedical applications. Most of those require an accurate measurement of pH. Unfortunately the accuracy of pH measurement is affected by the temperature of the measurement sample, which leads to an error in the measured pH value. To eliminate or reduce this effect, the temperature change must be compensated or avoided. The purpose of this paper is to describe the ways that the temperature can affect the measured pH value as well as how they are to be compensated or avoided. From the sensor point of view, the sensors that are used in pH measurement have attracted researchers� attention so as to develop and enhance those sensors which have a capability to meet an application requirement. Since the first pH sensor (glass electrode) failed to meet some application requirements, the developers have proposed a new electrode based on CMOS technique known as ISFET. This paper also aims to highlight the works which were done based on glass electrode and ISFET with concentration on advantages and disadvantages of each technique.